Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 2: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)
MA 2.5: Talk
Monday, March 17, 2025, 10:30–10:45, H16
A comparison of Γ-point symmetries and phonon selection rules of spin-space and magnetic point group in Co2Mo3O8 — •Onur Ercem1, Felix Schilberth1,2, Lilian Prodan1, Vladimir Tsurkan1, Alexander Tsirlin3, István Kézsmárki1, and Joachim Deisenhofer1 — 1Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, D-86135 Augsburg, Germany — 2Department of Physics, Budapest University of Technology and Economics, 1111 Budapest, Hungary — 3Felix Bloch Institute for Solid-State Physics, Leipzig University, 04103 Leipzig, Germany
Co2Mo3O8, which has recently come into the focus of research, as different magnetically ordered ground states can be formed and tuned by external magnetic fields or doping. Co2Mo3O8 has a hexagonal structure, the polarization along the c-axis, and a collinear antiferromagnetic order below TN = 40 K. Reflectivity measurements were performed using the FTIR spectrometer, in the frequency range from 100 to 8000 cm−1, and the temperature range from 10 to 300 K could be covered. A preliminary analysis of the infrared-active modes for E ∥ c reveals that 8 out of the 9 predicted A1 modes are observed at the expected eigenfrequencies and the emergence of the mode at around 300 cm−1 below TN. In E ⊥ c at room temperature 10 modes were observed. Below TN two new modes at 301 cm−1 and at 362 cm−1 observed. Comparison was made with lattice dynamical calculations.
Keywords: Infrared Spectroscopy; Co2Mo3O8; Phonons